A Morphological Gap For Iberian Zospeum Filled: Zospeum Percostulatum Sp N. (Gastropoda, Eupulmonata, Carychiidae) A New Species From Asturias (Spain)

Zospeum percostulatum sp. n. from Cueva de La Herreria (Llanes, Asturias) is described. It is characterized by a relatively large shell (1.4-1.8 mm height), conical, with ovate aperture, continuous peristome and thickened parietal callus; shell costulate except two first whorls; without any sort of inner formations. It is the first clearly costulate Iberian species, filling a morphological gap in the Iberian clade, and the largest species from the Cantabrian region, being the first species described from Asturias.